How to invoke a shell script using java

Question

Hi
I am trying to invoke a shell script(unix) using java and I have tryied to load the shell using exec(cmd) and then trying to execute the shell.
But it is not working.
Can you please guide me on this matter.

Answer 1

Hi I am facing the same problem
I want to call a shell script through java in linux system of course.
I am using the following section of code .
public class LinuxServer {
     public static void main(String args[]){
          Runtime r = Runtime.getRuntime(); //get runtime information
          try
          Process Child = r.exec("/usr/bin/ksh") ; //execute command
          BufferedWriter outCommand = new BufferedWriter(new OutputStreamWriter(Child.getOutputStream()));
          outCommand.write("/opt/jboss-4.0.0/test1.sh");
          outCommand.flush();
          try
          Child.waitFor(); //wait for command to complete
          catch(InterruptedException e)
          { //handle waitFor failure
          System.out.println("ERROR: waitFor failure");
          System.exit(10); //exit application with exit code 10
          catch(IOException e)
          { //handle exec failure
          System.out.println("ERROR: exec failure"+e);
          System.exit(11); //exit application with exit code 11
But when I am compiling and running this script in the linux system,
Its giving the following error.
Exception in thread "main" java.lang.NoClassDefFoundError: while resolving class: LinuxServer
at java.lang.VMClassLoader.resolveClass(java.lang.Class) (/usr/lib/libgcj.so.5.0.0)
at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.5.0.0)
at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader) (/usr/lib/libgcj.so.5.0.0)
at java.lang.Class.forName(java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)
at JvThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)
at JvRunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0)
at __gcj_personality_v0 (/opt/jboss-4.0.0/java.version=1.4.2)
at __libc_start_main (/lib/tls/libc-2.3.4.so)
at JvRegisterClasses (/opt/jboss-4.0.0/java.version=1.4.2)
Caused by: java.lang.ClassNotFoundException: java.lang.StringBuilder not found in [file:/usr/local/staf/lib/JSTAF.jar, file:/usr/local/staf/samples/demo/STAFDemo.jar, file:/home/db2inst4/sandip/staf/lib/JSTAF.jar, file:/home/db2inst4/sandip/staf/samples/demo/STAFDemo.jar, file:/usr/share/java/libgcj-3.4.3.jar, file:./, core:/]
at java.net.URLClassLoader.findClass(java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at gnu.gcj.runtime.VMClassLoader.findClass(java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at java.lang.ClassLoader.loadClass(java.lang.String, boolean) (/usr/lib/libgcj.so.5.0.0)
at JvFindClass(_Jv_Utf8Const, java.lang.ClassLoader) (/usr/lib/libgcj.so.5.0.0)
at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader) (/usr/lib/libgcj.so.5.0.0)
at JvBytecodeVerifier.verify_instructions_0() (/usr/lib/libgcj.so.5.0.0)
at JvVerifyMethod(_Jv_InterpMethod) (/usr/lib/libgcj.so.5.0.0)
at JvPrepareClass(java.lang.Class) (/usr/lib/libgcj.so.5.0.0)
at JvWaitForState(java.lang.Class, int) (/usr/lib/libgcj.so.5.0.0)
at java.lang.VMClassLoader.linkClass0(java.lang.Class) (/usr/lib/libgcj.so.5.0.0)
at java.lang.VMClassLoader.resolveClass(java.lang.Class) (/usr/lib/libgcj.so.5.0.0)
...9 more
Pls help